Improvement in locking-latches



UNITED STATES,

PATENT OFFICE.,

-GEORGE SHERMAN, OE LONG rsLAND orTY, AND GEORGE HAMANN, OE NEW YOEE, N. Y.

iMPRovEMENT INLOCK'ING-LATCHE'S.

Specification forming part of Letters PatentNo. 154,420, dated August 5, 1874 application filed June 27,1874. Y

To all whom it mag/concerm Be it known that we, GEORGE SHERMAN, of Long Island City, in the county of Queens andjState of NewYork, and GEORGE HAMANN, of New York, in the county of New York and State of New York, have invented ya new and Improved Push-Latch Lock, of which the following is a specification:

Figure l is a face view of our improvedpushlatch lock, the face-plate being removed. Fig. 2 is a vertical section of the same taken on the plane of the line k k, Fig. 1; and Fig. 3 is a horizontal section of the'. same taken on the plane of the line c c, Fig. l, looking in the direction of the arrow;

Similar letters ofreference indicate correspondin g parts in all theigures.

The object of this'invention is to produce latch-lock which will'be opened by pushing the key into it, so that the door may be swung open by the pressure applied to the key in withdrawing the latch. Our invention consists in a peculiar combination of an L-shaped lever for actuating the latch with a series of tumblers and other levers for locking the latch. When the key is inserted and pushed into the lock it irst reaches the tuinblers and swings them, so that the' farther inward motion of the key may swing the L-shapednlever, and thereby aect. the latch in the desired manner.

In the accompanying drawing, the letter A represents the case of our lock. b is the faceplate of said lock, and da cylindrical projection on the face-plate, having a narrow Inortise for the reception of the fiat key B. The lock is usually applied to the inner side of the door C, so that the cylinder d projects outwardly and through'the door, as indicated in Fig. 2; but the lockmay also be applied in a mortise and into the edge of the door, or in any other suitable manner. D is the latch or bolt of the lock, being placed with its shank be,- tween suitable guides e e, which are secured within the lock-case, and arranged to project with its end through an opening in the end of the case. A handle, f, may be pivoted to the inner end of the latch, as shown in Fig. 1, and arranged to project through the end of the case and notched, so that it may serve to move handle f the latch may be connected with a suitable spindle having a knob, so that by turning said knob the latch may be moved in the desired manner from the inside. A lug, g, which projects inwardly from the body of the bolt or latch, or from the handle f, enters between the end of a lever E, and a spring, F, both of which are arranged in the lock-case, the lever E being pivoted to said case at h, as clearly shown in Fig. 1.- The spring F bearing against the lug g has the tendency to push the bolt D out of the lock-case, and the lever E bearing against the opposite side of the lug g must be moved, in order to Adraw the latch into the lock-case. The spring F, crowding the lug g against the lever E, also swings said lever into a position from which said lever must bemoved by the key in order to unlock the door. For thus unlocking the door an L- shaped lever, G, is, at i, Apivoted' in iixed plates jj, that are secured within the lock-case. One arm of the lever YG is in'the way of the mortise in the projection d-that isto say, in

the way of the key-While the other end of said lever G bears against the lever E. When the key Bis inserted into the lock and pushed against the lever G, it would, were there no other obstruction, swing the lever G, and thereby also swing the lever Fi and crowd the latter against the projecting lug g, and thus draw the latch into the lock; but in order to prevent any pin which may be introduced in the cylinder d from thus affecting the lever G, We have pivoted a series of tumblers, H H, within the lock, and provided the lever E Wlth a jointed projection, I. This jointed portion I bears, with its hook end m, against the outer end of the tumblers H H when the latch is locked. The inner ends of the tumblers are in line with the opening through which the key is inserted. Proper springs l l crowd the inner ends of the tumblers toward thekey. The outer ends of the tumblers, moreover, are notched, as indicated in Fig. 3. When, now, the key is introduced into the lock it will rst reach the tumblers and swing them, so that their notched por-V tions will be exactly in line with the hookshaped projection 'm that is formed at the outer end of thejointed portion I of the 4lever E, and the inward motion of the key Will then swing the lever G and carry the lever E against the lug g. NOW, it is evident that the lever E could not be carried against the lug g so as to Withdraw the bolt and unlock the door -if the projecting portion m of I Would not have an opportunity of entering the notches in the tumblers; and, therefore, it is evident, also, that by the arrangement of the tumblers5 in combination with the L- shaped lever G and hook m, a lock is produced that can only Abe opened by a key which .has recesses and projections so arranged as to move the tumblers respectively,in such a manner that their varously located notches may 'comein linewith the projection m at the very time that the lever G begins to move.

We claim as our invention- In a latch-lock operated by a push-key, the combination of the L- shaped leverG and the lever E, having the projection I m, with the tumblers H H, all arranged for operation substantially as described.

y'GEORGE SHERMAN.

GEORGE HAMANN;

Y Witnesses:

E. C. WEBB, J No. J. PURCELL. 

